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    <p>Firstly, in Ruby there are no method signatures. The closest would be checking the function's arity. Duck typing requires thinking differently (slightly).</p> <p>The Observable module is a start, but if you have a requirement to have multiple events from a single class it might not be enough.</p> <p>This is a quick sketch. It supports methods and blocks. Modify as necessary to adapt for your code, threading approach, etc. For example, you could use method_missing to have the event name in the method name rather than having it as a parameter.</p> <pre><code>class EventBase def initialize @listeners = Hash.new end def listen_event(name, *func, &amp;p) if p (@listeners[name] ||= Array.new) &lt;&lt; p else (@listeners[name] ||= Array.new) &lt;&lt; func[0] end end def ignore_event(name, func) return if !@listeners.has_key?(name) @listeners[name].delete_if { |o| o == func } end def trigger_event(name, *args) return if !@listeners.has_key?(name) @listeners[name].each { |f| f.call(*args) } end end class MyClass &lt; EventBase def raise_event1(*args) trigger_event(:event1, *args) end def raise_event2(*args) trigger_event(:event2, *args) end end class TestListener def initialize(source) source.listen_event(:event1, method(:event1_arrival)) source.listen_event(:event2) do |*a| puts "event 2 arrival, args #{a}" end end def event1_arrival(*a) puts "Event 1 arrived, args #{a}" end end s = MyClass.new l = TestListener.new(s) s.raise_event1("here is event 1") s.raise_event2("here is event 2") </code></pre>
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